AU501585B2 - Two voice frequency receiver - Google Patents

Two voice frequency receiver

Info

Publication number
AU501585B2
AU501585B2 AU21438/77A AU2143877A AU501585B2 AU 501585 B2 AU501585 B2 AU 501585B2 AU 21438/77 A AU21438/77 A AU 21438/77A AU 2143877 A AU2143877 A AU 2143877A AU 501585 B2 AU501585 B2 AU 501585B2
Authority
AU
Australia
Prior art keywords
frequency receiver
voice frequency
voice
receiver
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
AU21438/77A
Other versions
AU2143877A (en
Inventor
B. R. Eriksson A. G Carlqvist
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of AU2143877A publication Critical patent/AU2143877A/en
Application granted granted Critical
Publication of AU501585B2 publication Critical patent/AU501585B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Noise Elimination (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Radar Systems Or Details Thereof (AREA)
AU21438/77A 1976-03-09 1977-01-19 Two voice frequency receiver Expired AU501585B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7603136A SE397763B (en) 1976-03-09 1976-03-09 RECEIVER DEVICE FOR SENSITIVE DETECTION OF ATMINSTONE TWO TONE FREQUENCIES IN AN INCOMING TONE SIGNAL
SESE7603136 1976-03-09

Publications (2)

Publication Number Publication Date
AU2143877A AU2143877A (en) 1978-07-27
AU501585B2 true AU501585B2 (en) 1979-06-21

Family

ID=20327272

Family Applications (1)

Application Number Title Priority Date Filing Date
AU21438/77A Expired AU501585B2 (en) 1976-03-09 1977-01-19 Two voice frequency receiver

Country Status (22)

Country Link
US (1) US4107475A (en)
AR (1) AR213111A1 (en)
AU (1) AU501585B2 (en)
BR (1) BR7700987A (en)
CA (1) CA1064633A (en)
DE (1) DE2702026C2 (en)
DK (1) DK142719B (en)
EG (1) EG13315A (en)
ES (1) ES456619A1 (en)
FI (1) FI60802C (en)
FR (1) FR2344190A1 (en)
GB (1) GB1544174A (en)
HU (1) HU176229B (en)
IE (1) IE45187B1 (en)
IN (1) IN155829B (en)
IT (1) IT1085209B (en)
MY (1) MY8000166A (en)
NL (1) NL186486C (en)
NO (1) NO140085C (en)
SE (1) SE397763B (en)
SU (1) SU656562A3 (en)
YU (1) YU41466B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227055A (en) * 1978-12-07 1980-10-07 Bell Telephone Laboratories, Incorporated Multifrequency receiver
US4395595A (en) * 1980-04-23 1983-07-26 Nippon Electric Co., Ltd. Digital pushbutton signalling receiver
US4385208A (en) * 1981-04-15 1983-05-24 Bell Telephone Laboratories, Incorporated Multifrequency receiver
US4489280A (en) * 1982-07-15 1984-12-18 Sperry Corporation Signal harmonic processor
US4599495A (en) * 1985-02-28 1986-07-08 Northern Telecom Limited Apparatus for multifrequency signalling tone detection
DE3710695A1 (en) * 1987-03-31 1988-10-20 Nixdorf Computer Ag CIRCUIT ARRANGEMENT FOR DETECTING DOUBLE-TONE MULTI-FREQUENCY SIGNALS IN TELEPHONE SYSTEMS
US20080068132A1 (en) * 2006-05-16 2008-03-20 Georges Kayanakis Contactless radiofrequency device featuring several antennas and related antenna selection circuit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1487973B2 (en) * 1966-05-12 1970-10-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for a voice-protected single or multi-frequency signal receiver
GB1342904A (en) * 1970-07-31 1974-01-10 Plessey Telecommunications Res Multifrequency data receivers
NL7101521A (en) * 1971-02-05 1972-08-08
US3934096A (en) * 1973-04-27 1976-01-20 Hitachi, Ltd. Multi-frequency signal receiving circuit
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver
JPS5543677B2 (en) * 1974-05-15 1980-11-07
DE2517024C3 (en) * 1975-04-17 1978-03-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for a signal receiver for blocking signals whose level fluctuates
SE396684B (en) * 1976-02-09 1977-09-26 Ericsson Telefon Ab L M HALL CIRCUIT IN A RECEIVER DEVICE FOR MFC SIGNALING

Also Published As

Publication number Publication date
ES456619A1 (en) 1978-01-16
IT1085209B (en) 1985-05-28
NO140085C (en) 1979-07-04
BR7700987A (en) 1977-10-18
FI770021A (en) 1977-09-10
SU656562A3 (en) 1979-04-05
IN155829B (en) 1985-03-16
US4107475A (en) 1978-08-15
CA1064633A (en) 1979-10-16
DK101977A (en) 1977-09-10
SE397763B (en) 1977-11-14
DK142719C (en) 1981-08-10
NO770816L (en) 1977-09-12
FI60802B (en) 1981-11-30
DK142719B (en) 1980-12-29
HU176229B (en) 1981-01-28
NL186486B (en) 1990-07-02
EG13315A (en) 1981-03-31
DE2702026C2 (en) 1985-10-24
FI60802C (en) 1982-03-10
YU62277A (en) 1982-05-31
NL186486C (en) 1990-12-03
YU41466B (en) 1987-08-31
SE7603136L (en) 1977-09-10
NL7700640A (en) 1977-09-13
NO140085B (en) 1979-03-19
IE45187L (en) 1977-09-09
IE45187B1 (en) 1982-07-14
FR2344190A1 (en) 1977-10-07
AU2143877A (en) 1978-07-27
AR213111A1 (en) 1978-12-15
GB1544174A (en) 1979-04-11
MY8000166A (en) 1980-12-31
FR2344190B1 (en) 1983-10-07
DE2702026A1 (en) 1977-09-15

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